Q.
An open carriage in a goods train is moving with a uniform velocity of 10$\ ms^{- 1}$. If the rain adds water with zero velocity at the rate of 5 $kgs^{- 1}$, then the additional force applied by the engine to maintain the same velocity of the train is
A) 0.5 N
B) 2.0 N
C) 50 N
D) 25 N
Explanation
(c) $F = v\frac{dm}{dt} = 10 \times 5$ N = 50 N
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.